/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SOURCE_BUFFER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SOURCE_BUFFER_H_

#include <memory>

#include "base/memory/scoped_refptr.h"
#include "media/base/stream_parser.h"
#include "third_party/blink/public/platform/web_source_buffer_client.h"
#include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_append_mode.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_typedefs.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
#include "third_party/blink/renderer/modules/event_target_modules.h"
#include "third_party/blink/renderer/modules/mediasource/media_source_attachment_supplement.h"
#include "third_party/blink/renderer/modules/mediasource/track_default_list.h"
#include "third_party/blink/renderer/platform/heap/prefinalizer.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cancellable_task.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"

namespace blink {

class AudioTrackList;
class DOMArrayBuffer;
class DOMArrayBufferView;
class EventQueue;
class ExceptionState;
class MediaSource;
class MediaSourceTracer;
class MediaSourceAttachmentSupplement;
class ScriptState;
class SourceBufferConfig;
class TimeRanges;
class VideoTrackList;
class WebSourceBuffer;

class SourceBuffer final : public EventTarget,
                           public ActiveScriptWrappable<SourceBuffer>,
                           public ExecutionContextLifecycleObserver,
                           public WebSourceBufferClient {
  DEFINE_WRAPPERTYPEINFO();
  USING_PRE_FINALIZER(SourceBuffer, Dispose);

 public:
  SourceBuffer(std::unique_ptr<WebSourceBuffer>, MediaSource*, EventQueue*);
  ~SourceBuffer() override;

  // SourceBuffer.idl methods
  V8AppendMode mode() const { return V8AppendMode(mode_); }
  void setMode(const V8AppendMode&, ExceptionState&);
  bool updating() const { return updating_; }
  TimeRanges* buffered(ExceptionState&) const;
  double timestampOffset() const;
  void setTimestampOffset(double, ExceptionState&);
  void appendBuffer(DOMArrayBuffer* data, ExceptionState&);
  void appendBuffer(NotShared<DOMArrayBufferView> data, ExceptionState&);
  ScriptPromise<IDLUndefined> appendEncodedChunks(
      ScriptState* script_state,
      const V8EncodedChunks* chunks,
      ExceptionState& exception_state);
  void abort(ExceptionState&);
  void remove(double start, double end, ExceptionState&);
  void changeType(const String& type, ExceptionState&);
  void ChangeTypeUsingConfig(ExecutionContext*,
                             const SourceBufferConfig*,
                             ExceptionState&);
  double appendWindowStart() const;
  void setAppendWindowStart(double, ExceptionState&);
  double appendWindowEnd() const;
  void setAppendWindowEnd(double, ExceptionState&);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(updatestart, kUpdatestart)
  DEFINE_ATTRIBUTE_EVENT_LISTENER(update, kUpdate)
  DEFINE_ATTRIBUTE_EVENT_LISTENER(updateend, kUpdateend)
  DEFINE_ATTRIBUTE_EVENT_LISTENER(error, kError)
  DEFINE_ATTRIBUTE_EVENT_LISTENER(abort, kAbort)
  TrackDefaultList* trackDefaults() const { return track_defaults_.Get(); }
  void setTrackDefaults(TrackDefaultList*, ExceptionState&);

  AudioTrackList& audioTracks();
  VideoTrackList& videoTracks();

  // "_Locked" requires these be called while in the scope of callback of
  // |source_|'s attachment's RunExclusively(). Other methods without "_Locked"
  // may also require the same, since they can be called from within these
  // methods.
  void SetMode_Locked(
      V8AppendMode::Enum,
      ExceptionState*,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void GetBuffered_Locked(
      WebTimeRanges* /* out */,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */) const;
  void Remove_Locked(double start,
                     double end,
                     ExceptionState*,
                     MediaSourceAttachmentSupplement::ExclusiveKey pass_key);

  void RemovedFromMediaSource();
  double HighestPresentationTimestamp();

  // ScriptWrappable
  bool HasPendingActivity() const final;

  // ExecutionContextLifecycleObserver
  void ContextDestroyed() override;

  // EventTarget interface
  ExecutionContext* GetExecutionContext() const override;
  const AtomicString& InterfaceName() const override;

  // WebSourceBufferClient interface
  bool InitializationSegmentReceived(
      const std::vector<MediaTrackInfo>&) override;
  void NotifyParseWarning(const ParseWarning) override;

  void Trace(Visitor*) const override;

 private:
  void Dispose();

  bool IsRemoved() const;
  void ScheduleEvent(const AtomicString& event_name);

  bool PrepareAppend(double media_time, size_t new_data_size, ExceptionState&);
  bool EvictCodedFrames(double media_time, size_t new_data_size);
  void AppendBufferInternal(base::span<const unsigned char>, ExceptionState&);
  void AppendEncodedChunksAsyncPart();
  void AppendBufferAsyncPart();
  void AppendError(MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);

  void RemoveAsyncPart();

  void CancelRemove();
  void AbortIfUpdating();

  void RemoveMediaTracks();

  // "_Locked" requires these be called while in the scope of callback of
  // |source_|'s attachment's RunExclusively(). Other methods without "_Locked"
  // may also require the same, since they can be called from within these
  // methods.
  void SetTimestampOffset_Locked(
      double,
      ExceptionState*,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void SetAppendWindowStart_Locked(
      double,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void SetAppendWindowEnd_Locked(
      double,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void Abort_Locked(
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void ChangeType_Locked(
      const String& type,
      ExceptionState*,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void AppendEncodedChunks_Locked(
      std::unique_ptr<media::StreamParser::BufferQueue> buffer_queue,
      size_t size,
      ExceptionState* exception_state,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void AppendBufferInternal_Locked(
      base::span<const unsigned char>,
      ExceptionState*,
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void AppendEncodedChunksAsyncPart_Locked(
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void AppendBufferAsyncPart_Locked(
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);
  void RemoveAsyncPart_Locked(
      MediaSourceAttachmentSupplement::ExclusiveKey /* passkey */);

  // Returns MediaElement playback position (i.e. MediaElement.currentTime() )
  // in seconds, or NaN if media element is not available.
  double GetMediaTime();

  const TrackDefault* GetTrackDefault(
      V8TrackDefaultType::Enum track_type,
      const AtomicString& byte_stream_track_id) const;
  AtomicString DefaultTrackLabel(
      V8TrackDefaultType::Enum track_type,
      const AtomicString& byte_stream_track_id) const;
  AtomicString DefaultTrackLanguage(
      V8TrackDefaultType::Enum track_type,
      const AtomicString& byte_stream_track_id) const;

  // TODO(https://crbug.com/878133): Remove these once worker thread track
  // creation and tracklist modifications are supported. These are needed for
  // now to retain stable BackgroundVideoOptimization support with experimental
  // MSE-in-Workers.
  void AddPlaceholderCrossThreadTracks(
      const std::vector<MediaTrackInfo>& new_tracks,
      scoped_refptr<MediaSourceAttachmentSupplement> attachment);
  void RemovePlaceholderCrossThreadTracks(
      scoped_refptr<MediaSourceAttachmentSupplement> attachment,
      MediaSourceTracer* tracer);

  std::unique_ptr<WebSourceBuffer> web_source_buffer_;

  // If any portion of an attached HTMLMediaElement (HTMLME) and the MediaSource
  // Extensions (MSE) API is alive (having pending activity or traceable from a
  // GC root), the whole group is not GC'ed. Here, using Member,
  // instead of Member, because |source_|'s and |track_defaults_|'s wrappers
  // need to remain alive at least to successfully dispatch any events enqueued
  // by the behavior of the HTMLME+MSE API. It makes those wrappers remain alive
  // as long as this SourceBuffer's wrapper is alive.
  Member<MediaSource> source_;
  Member<TrackDefaultList> track_defaults_;
  Member<EventQueue> async_event_queue_;

  V8AppendMode::Enum mode_ = V8AppendMode::Enum::kSegments;
  bool updating_;

  double timestamp_offset_;
  Member<AudioTrackList> audio_tracks_;
  Member<VideoTrackList> video_tracks_;
  double append_window_start_;
  double append_window_end_;
  bool first_initialization_segment_received_;

  // |updating_| logic, per spec, allows at most one of the following async
  // operations to be exclusively pending for this SourceBuffer: appendBuffer(),
  // appendEncodedChunks(), or remove(). The following three sections
  // respectively track the async state for these pending operations:

  // This handle is valid only during the scope of synchronous and asynchronous
  // follow-up of appendBuffer().
  TaskHandle append_buffer_async_task_handle_;

  // This resolver is set and valid only during the scope of synchronous and
  // asynchronous follow-up of appendEncodedChunks().
  std::unique_ptr<media::StreamParser::BufferQueue> pending_chunks_to_buffer_;
  Member<ScriptPromiseResolver<IDLUndefined>> append_encoded_chunks_resolver_;
  TaskHandle append_encoded_chunks_async_task_handle_;

  // These are valid only during the scope of synchronous and asynchronous
  // follow-up of remove().
  double pending_remove_start_;
  double pending_remove_end_;
  TaskHandle remove_async_task_handle_;

  // Temporary vectors used for MSE-in-Workers removal of the audio and video
  // tracks from the media element when needed by this SourceBuffer.
  // TODO(https://crbug.com/878133): Refactor to remove these once
  // CrossThreadMediaSourceAttachments, TrackBase and TrackListBase support
  // track creation off-the-main thread.
  Vector<String> audio_track_ids_for_crossthread_removal_;
  Vector<String> video_track_ids_for_crossthread_removal_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SOURCE_BUFFER_H_